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-DEC Cal Veo WORK L 7 'VtNN L Diesel Service, Inc. 'rIsERViCE C . Background R & L Diesel Service, Inc. (R & L) operates a diesel machinery parts and maintenance service at its yard on West Lane in the City of Stockton. The yard is paved and stoped to the adjacent streets and railroad right of way for raln water drainage. One of the services provided is steam cleaning of engines. The oily water from this cleaning operation discharges to a redwood lined pit and drain field. The Regional Water Quality Control Board has instructed the company to replace this oily water collection and handling system with a new system which will prevent contamination of the soil and/or ground water. Cleanup The steam cleaning operation will be shut down during the cleanup. The pit will be emptied of all liquid by a waste disposal company approved to handle oily waste. This will be accomplished by means of a vacuum truck which will transport the liquid waste to a suitable recovery/disposal facility offsite. A plastic sheet will be placed on the pavement in a suitable area of the yard and the redwood boards, contaminated soil, gravel and sand will be removed from the pit by means of a backhoe and placed on top of the plastic sheet. This waste pile will be covered with additional plastic to prevent leaching by rain water. All liquid drainage from the waste solids will also be contained on the plastic. The pit and drain field will be excavated until all areas show no visual evidence of oil or grease contamination. Mr. Harlin D. Knoll of the Environmental Health Division of the San Joaquin Health District will be notified and requested to inspect the excavation. All excavated material will be stored on site (covered) until completion of this inspection. Upon approval from Mr. Knoll, the excavation will be filled with clean fill. The waste material will be sampled and analyzed and sent to an-appropriate disposal site.